PRODUCTION OF HIGH TENSILE STRENGTH HOT DIP GALVANIZED STEEL SHEET

PURPOSE: To stably inhibit uncoating at a low cost at the time of applying hot dipping or galvannealing by means of a continuous line to a steel sheet containing one or more kinds among highly oxidizing elements, such as Si, P, Mn, Ti, Nb, Al, Cr, and B, and further containing, if necessary, Ni, Cu,...

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Bibliographische Detailangaben
Hauptverfasser:	ONO TAKASHI, KATO CHIAKI, UNNO SHIGERU, MOCHIZUKI KAZUO, KUWAGATA MASAYOSHI
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	PURPOSE: To stably inhibit uncoating at a low cost at the time of applying hot dipping or galvannealing by means of a continuous line to a steel sheet containing one or more kinds among highly oxidizing elements, such as Si, P, Mn, Ti, Nb, Al, Cr, and B, and further containing, if necessary, Ni, Cu, Mo, V, and other elements. CONSTITUTION: At the time of plating a high tensile strength steel sheet containing highly oxiding elements, the steel sheet is previously annealed at the recrystallization temp. by means of continuous annealing equipment. Subsequently, the concentrated layer of the components in the steel at the surface of the steel sheet is pickled in continuous hot dip galvanizing equipment by using hydrochloric acid or sulfuric acid under the condition of (0.05 to 5)g/m pickling loss. The steel sheet is heated and reduced in the continuous hot dip galvanizing equipment again and then subjected to hot dip galvanizing. By this method, the high tensile strength hot dip galvanized steel sheet can be produced.